PDF M685 Data sheet ( Hoja de datos )

Número de pieza	M685
Descripción	DUAL SAW / SELECTABLE FREQUENCY VCSO
Fabricantes	Integrated Circuit Systems
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No Preview Available ! Integrated Circuit Systems, Inc. Preliminary Information M685 DUAL SAW, SELECTABLE FREQUENCY VCSO GENERAL DESCRIPTION The M685 is a dual SAW, selectable frequency VCSO frequency source for low-jitter clock generation. An integrated SAW (surface acoustic wave) delay line implements the high-Q VCO (voltage controlled oscillator) function, which results in low output phase noise and very low jitter. The M685-01 is available in a range of center frequencies from 125 to 175 MHz. The M685-02 provides 500 to 700 MHz. Guaranteed minimum pull-range of ±120 ppm meets GbE requirements. (It also fully satisfies ±50 ppm minimum pull-range specification commonly required.) Industry- standard Kvco (VCO Gain) provides full replacement compatibility. The M685 is well suited for phase-locked loop implementations, clock and data recovery circuits, and other timing applications in telecom and optical fiber networking systems (e.g., OC-48). FEATURES ◆ Two integrated SAW devices and selectable output frequency; supports multi-rate optical interfaces ◆ M685-01 output frequencies from 125 to 175 MHz M685-02 output frequencies from 500 to 700 MHz (Specify center frequencies at time of order) ◆ Industry-standard Kvco for full compatibility ◆ Low phase jitter 0.2ps rms typical for the M685-02 (50kHz to 80MHz) ◆ Differential 3.3V LVPECL output ◆ Single 3.3V power supply ◆ Small 5 x 7.5mm SMT (surface mount) package BLOCK DIAGRAM MM668805 PIN ASSIGNMENT (5 x 7.5mm SMT) MM668850 (Top View) Figure 1: Pin Assignment Sample of Available Output Frequencies VCSO Center Frequencies1 (MHz) Applications 155.5200, 167.3316 SONET/SDH, SONET/SDH FEC 156.2500, 161.1328 Gigabit Ethernet, GbE FEC 622.0800, 669.3266 SONET/SDH, SONET/SDH FEC 625.0000, 644.5313 Gigabit Ethernet, GbE FEC Table 1: Sample of Available Output Frequencies Note 1: Specify VCSO center frequencies at time of order SAW Delay Line VIN VCSO Phase Shifter SAW Delay Line FOUT nFOUT VCSO Phase Shifter F_SEL Figure 2: Block Diagram M685 Datasheet Rev 0.4 Revised 16Nov2004 M685 Dual SAW, Selectable Frequency VCSO Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400 1 page Integrated Circuit Systems, Inc. PARAMETER MEASUREMENT INFORMATION M685 DUAL SAW, SELECTABLE FREQUENCY VCSO Preliminary Information Output Rise and Fall Time 80% Clock 20% Outputs tR 80% VP-P 20% tF Figure 3: Output Rise and Fall Time Output Duty Cycle nFOUT FOUT tPW (Output Pulse Width) odc = tPW tPERIOD tPERIOD Figure 4: Output Duty Cycle DEVICE PACKAGE - 5 x 7.5mm SMT (Surface Mount) Package Mechanical Dimensions: ICSM685 -02-AA-AH Dimensions are in mm; dimensions in [ ] are in inches Unless otherwise specified, all dimensions are ±0.13 [0.005] Figure 5: Device Package - 5 x 7.5mm SMT (Surface Mount) Package M685 Datasheet Rev 0.4 5 of 7 Revised 16Nov2004 Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400 5 Page

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